Acres of Land Acquired

No definition available.

Name:	dre_AcresOfLandAcquired
Namespace Prefix:	dre_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Element represents the face value of debt assumed in an acquisition.

+ References

No definition available.

+ Details

Name:	dre_FaceValueOfAssumedDebt
Namespace Prefix:	dre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The number of real estate properties, by acquisition, product type, or geographic location, acquired during the reporting period.

+ References

No definition available.

+ Details

Name:	dre_NumberOfRealEstatePropertiesAcquired
Namespace Prefix:	dre_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of secured loans assumed in property acquisition

+ References

No definition available.

+ Details

Name:	dre_NumberOfSecuredLoansAssumedInPropertyAcquisition
Namespace Prefix:	dre_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Prior Equity Contributions to Unconsolidated Entities [Line Items]

+ References

No definition available.

+ Details

Name:	dre_PriorEquityContributionsToUnconsolidatedEntities
Namespace Prefix:	dre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Square Footage Of Real Estate Properties Acquired Or Disposed.

+ References

No definition available.

+ Details

Name:	dre_SquareFootageOfRealEstatePropertiesAcquiredOrDisposed
Namespace Prefix:	dre_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

The calculated weighted-average amortization period of a major class of finite-lived intangible assets acquired during the current period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 44

-Subparagraph a(3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275

+ Details

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetWeightedAverageUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cash paid to acquire the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph f(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 59

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 23

-URI http://asc.fasb.org/extlink&oid=6909708&loc=d3e1043-128460

+ Details

Name:	us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 15, 16, 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585

+ Details

Name:	us-gaap_CashAcquiredFromAcquisition
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The number of limited partner units issued.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 5

-Subparagraph (SAB TOPIC 4.F)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187171-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 4

-Section F

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 87-21

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Practice Bulletin (PB)

-Number 14

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_LimitedPartnersCapitalAccountUnitsIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Increase in noncontrolling interest balance because of a business combination that occurred during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 15, 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Significant Acquisitions and Dispositions (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended				12 Months Ended	0 Months Ended		3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010 loans	Dec. 31, 2011 Premier Portfolio [Member] years buildings	Dec. 31, 2010 Premier Portfolio [Member] buildings	Dec. 31, 2011 Other 2011 Acquisitions [Member] years buildings	Jul. 01, 2010 Dugan Realty [Member] sqft buildings A	Dec. 31, 2010 Other 2010 Acquisitions [Member] buildings	Apr. 01, 2009 Consolidation of Retail Joint Ventures [Member]	Dec. 31, 2011 Industrial Buildings [Member] Premier Portfolio [Member] buildings	Dec. 31, 2010 Industrial Buildings [Member] Premier Portfolio [Member] buildings	Dec. 31, 2011 Office [Member] Premier Portfolio [Member] buildings	Dec. 31, 2010 Office [Member] Premier Portfolio [Member] buildings	Dec. 31, 2011 Raleigh North Carolina [Member] Industrial Buildings [Member] Other 2011 Acquisitions [Member] buildings	Dec. 31, 2011 Raleigh North Carolina [Member] Office [Member] Other 2011 Acquisitions [Member] buildings	Dec. 31, 2011 Chicago Illinois [Member] Industrial Buildings [Member] Other 2011 Acquisitions [Member] buildings	Dec. 31, 2010 Chicago Illinois [Member] Industrial Buildings [Member] Other 2010 Acquisitions [Member] buildings	Dec. 31, 2011 Dallas Texas [Member] Industrial Buildings [Member] Other 2011 Acquisitions [Member] buildings	Dec. 31, 2011 Minneapolis, Minnesota [Member] Industrial Buildings [Member] Other 2011 Acquisitions [Member] buildings	Dec. 31, 2011 Southern California [Member] Industrial Buildings [Member] Other 2011 Acquisitions [Member] buildings	Dec. 31, 2011 Phoenix Arizona [Member] Industrial Buildings [Member] Other 2011 Acquisitions [Member] buildings	Dec. 31, 2010 Phoenix Arizona [Member] Industrial Buildings [Member] Other 2010 Acquisitions [Member] buildings	Dec. 31, 2011 Savannah Georgia [Member] Industrial Buildings [Member] Other 2011 Acquisitions [Member] buildings	Dec. 31, 2011 Indianapolis Indiana [Member] Industrial Buildings [Member] Other 2011 Acquisitions [Member] buildings	Dec. 31, 2011 Indianapolis Indiana [Member] Office [Member] Other 2011 Acquisitions [Member] buildings	Dec. 31, 2011 Atlanta Georgia [Member] Office [Member] Other 2011 Acquisitions [Member] buildings	Dec. 31, 2011 Medical Office Properties [Member] buildings	Dec. 31, 2010 Houston Texas [Member] Industrial Buildings [Member] Other 2010 Acquisitions [Member] buildings	Dec. 31, 2010 South Florida [Member] Industrial Buildings [Member] Other 2010 Acquisitions [Member] buildings	Dec. 31, 2010 South Florida [Member] Office [Member] Other 2010 Acquisitions [Member] buildings	Dec. 31, 2010 Nashville Tennessee [Member] Industrial Buildings [Member] Other 2010 Acquisitions [Member] buildings	Dec. 31, 2010 Columbus Ohio [Member] Industrial Buildings [Member] Other 2010 Acquisitions [Member] buildings	Dec. 31, 2010 Charlotte North Carolina [Member] Medical Office Properties [Member] Other 2010 Acquisitions [Member] buildings	Jul. 01, 2010 Secured Loan Maturing in October 2010 [Member] Dugan Realty [Member]	Jul. 01, 2010 Secured Loan Maturing in October 2012 [Member] Dugan Realty [Member]
Business Combination, Acquisition Related Costs	$ 2.3	$ 1.9
Cash consideration paid for acquisition			27.4
Number of real estate properties acquired			55	39	43	106	13		12	38	4	1	6	1	12	2	3	3	2	1	1	1	1	1	1	11	3	2	2	1	1	1
Square Footage Of Real Estate Properties Acquired Or Disposed						20,800,000
Face value of assumed debt			124.4
Unit issuance to the sellers			2.1
Unit issuance to the sellers, fair value			28.4
Weighted average remaining life of property (years)			3.5		6.69
Cash Acquired from Acquisition						28.1
Payments to Acquire Businesses, Net of Cash Acquired						138.6
Acres of Land Acquired						63
Number Of Secured Loans Assumed In Property Acquisition		19
Debt Instrument, Face Amount		479.0																															195.4	87.6
Prior Equity Contributions to Unconsolidated Entities								$ 37.9